Geochemistry of Y plus REE in stratiform tourmalinites and their tourmalines: implications for their genesis

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Authors

ČOPJAKOVÁ Renata ŠKODA Radek NOVÁK Milan VAŠINOVÁ GALIOVÁ Michaela

Year of publication 2013
Type Article in Proceedings
Conference MINERAL DEPOSIT RESEARCH FOR A HIGH-TECH WORLD, VOLS. 1-4
MU Faculty or unit

Faculty of Science

Citation
Field Geology and mineralogy
Keywords Y plus REE; tourmaline; stratiform tourmalinites; Bohemian Massif
Description Yttrium+REE contents in stratiform tourmalinites and their tourmaline from two different geological units, Svratka Unit and Krkonose-Jizera Unit (Bohemian Massif, Czech Republic) are reported to reveal tourmalinite genesis and tourmaline growth history. Premetamorphic tourmaline grains rimmed by younger metamorphic schorl-dravite were distinguished in both regions. The wing-shaped Y+REE patterns with minimum close to Eu in premetamorphic oxy-dravite from the Krkonose-Jizera Unit, and the Y+REE whole rock signature indicate important contribution of seawater in the oxy-dravite forming fluids. On the contrary, Y+REE patterns in premetamorphic schorl cores from the Svratka Unit correspond well to presumable exhalative origin of B-bearing fluids. Metamorphic rims of schorl-dravite at both regions show typically LREE-enriched patterns with pronounced positive Eu anomalies reflecting composition of metamorphic fluids.
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